Half the battle in headstand is overcoming fear.
What stories do you tell yourself about what you're capable of? How true are they?
I remember when I first started practicing headstand, I felt scared and hesitant. I'd try walking my hips up over my head but then back off and take child's pose. I'd watch other people in the room. In my mind, I was telling myself, I'm weak, I can't do this, my neck isn't strong enough.
Eventually I realized that story is false. It was wrapped up in experiences I've seen other people go through-- family and friends with back and neck issues.
The reality is that I have a strong back and strong neck. A healthy spine.
I was telling myself an untrue story, rather than being present to the moment. All I needed was an open mind and to practice the balance.
Many headstands later, I now enjoy this pose.
If you're feeling stuck with an inversion (or any pose, really), try questioning your fear. Release it. Become incredibly receptive to this moment.